WO2024024425A1

WO2024024425A1 - Power conversion device and program

Info

Publication number: WO2024024425A1
Application number: PCT/JP2023/024890
Authority: WO
Inventors: 薫 ▲高▼嶋; 佳祐外山; 諒哉風岡; 裕太笹間; 俊一久保
Original assignee: 株式会社デンソー
Priority date: 2022-07-29
Filing date: 2023-07-05
Publication date: 2024-02-01

Abstract

This power conversion device comprises: a high-potential-side electrical path (22H); a low-potential-side electrical path (22L); an inverter (20) having upper arm switches (SWH) and lower arm switches (SWL); and a motor (10) having armature windings (11) that are electrically connected, via conductive members (23), to connection points of the upper and lower arm switches. The power conversion device comprises: an inter-power-storage-unit switch (40) that is provided to an inter-power-storage-unit electrical path (24) that electrically connects a negative terminal of a first power storage unit (31) and a positive terminal of a second power storage unit (32); a bypass switch (50, 51) that makes an electrical connection between the negative terminals of the first and second power storage units and/or an electrical connection between the positive terminals of the first and second power storage units; and motor-side electrical paths (25–28) that electrically connect the armature windings or the conductive members to the inter-power-storage-unit electrical path.

Description

Power converter, program

Cross-reference of related applications

This application is based on Japanese Application No. 2022-122116 filed on July 29, 2022, and the contents thereof are incorporated herein.

The present disclosure relates to a power conversion device and a program.

Conventionally, as described in Patent Document 1, an in-vehicle system is known that includes a motor, an inverter electrically connected to an armature winding of the motor, and first and second power storage units. This system includes a relay for switching the connection state of the first and second power storage units to a series connection state or a parallel connection state. Thereby, the first and second power storage units can be charged using either an external charger with a charging voltage of 400V or an external charger with a charging voltage of 800V. In addition, when an external charger with a charging voltage of 400V is used, the first and second power storage units are connected in parallel, so the system voltage is lowered to charge the first and second power storage units. be able to.

Patent No. 6930306

It is desired to simplify the configuration for switching the connection state of the first and second power storage units as much as possible.

The main purpose of the present disclosure is to provide a power conversion device and a program that can simplify the configuration.

The present disclosure provides a high potential side electrical path electrically connectable to a positive terminal of a first power storage unit;
a low potential side electrical path electrically connectable to the negative terminal of the second power storage unit;
an inverter having an upper arm switch electrically connected to the high potential side electrical path, and a lower arm switch electrically connected to the low potential side electrical path;
a motor having an armature winding electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member;
In a power conversion device comprising:
an inter-power storage unit switch provided in an inter-power storage unit electrical path that electrically connects the negative terminal of the first power storage unit and the positive terminal of the second power storage unit;
At least one of the electrical connection between the negative terminals of the first power storage unit and the second power storage unit, and the electrical connection between the positive terminals of the first power storage unit and the second power storage unit Bypass switch for making connections,
a motor-side electrical path that electrically connects the armature winding or the conductive member and the inter-power storage unit electrical path;
Equipped with.

In the present disclosure, the connection state of the first and second power storage units becomes a series connection state by turning on the inter-power storage unit switch and turning off the bypass switch. On the other hand, since the switch between the power storage units is turned off and the bypass switch is turned on, and the electric path on the motor side is provided, the connection state of the first and second power storage units is changed to that of the second power storage unit. The positive terminal is connected to the high potential side electrical path via the motor side electrical path, the armature winding and the inverter, or the negative terminal of the first power storage unit is connected to the motor side electrical path, the armature winding and the inverter. It becomes connected to the low potential side electrical path. At this time, the configurations of the motor and inverter are used. Therefore, it is possible to provide a power conversion device with a simplified configuration for switching the connection state of the first and second power storage units.

The above objects and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing is
FIG. 1 is an overall configuration diagram of a system according to a first embodiment, FIG. 2 is a flowchart showing the procedure of charging processing, FIG. 3 is a diagram showing how the switch is operated during high-voltage charging; FIG. 4 is a diagram showing how the switch is operated during low-voltage charging; FIG. 5 is an overall configuration diagram of the system according to the second embodiment, FIG. 6 is a flowchart showing the procedure of charging processing, FIG. 7 is an overall configuration diagram of a system according to a third embodiment, FIG. 8 is a flowchart showing the procedure of charging processing, FIG. 9 is a diagram showing the operation mode of the switch during low voltage charging, FIG. 10 is a diagram showing the operation mode of the switch during low voltage charging, FIG. 11 is an overall configuration diagram of the system according to the fourth embodiment, FIG. 12 is a flowchart showing the procedure of charging processing, FIG. 13 is an overall configuration diagram of the system according to the fifth embodiment, FIG. 14 is a flowchart showing the procedure of charging processing, FIG. 15 is an overall configuration diagram of the system according to the sixth embodiment, FIG. 16 is an overall configuration diagram of a system according to a modification of the sixth embodiment, FIG. 17 is an overall configuration diagram of a system according to a modification of the sixth embodiment, FIG. 18 is an overall configuration diagram of a system according to a modification of the sixth embodiment, FIG. 19 is an overall configuration diagram of the system according to the seventh embodiment, FIG. 20 is a diagram showing the operation mode of the switch when precharging with the first storage battery, FIG. 21 is a diagram showing the operation mode of the switch when precharging with the second storage battery, FIG. 22 is an overall configuration diagram of the system according to the eighth embodiment, FIG. 23 is a diagram showing the operation mode of the switch when precharging with the first storage battery, FIG. 24 is an overall configuration diagram of a system according to a modification of the seventh embodiment, FIG. 25 is an overall configuration diagram of a system according to another embodiment, FIG. 26 is an overall configuration diagram of a system according to another embodiment, FIG. 27 is an overall configuration diagram of a system according to another embodiment, FIG. 28 is an overall configuration diagram of a system according to another embodiment, FIG. 29 is an overall configuration diagram of a system according to another embodiment, FIG. 30 is an overall configuration diagram of a system according to another embodiment, FIG. 31 is an overall configuration diagram of a system according to another embodiment, FIG. 32 is an overall configuration diagram of a system according to another embodiment, FIG. 33 is an overall configuration diagram of a system according to another embodiment, FIG. 34 is an overall configuration diagram of a system according to another embodiment, FIG. 35 is an overall configuration diagram of a system according to another embodiment, FIG. 36 is an overall configuration diagram of a system according to another embodiment, FIG. 37 is an overall configuration diagram of a system according to another embodiment, FIG. 38 is an overall configuration diagram of a system according to another embodiment, FIG. 39 is a diagram showing how the switch is operated during low-voltage charging in the configuration of FIG. 38; FIG. 40 is an overall configuration diagram of a system according to another embodiment, FIG. 41 is an overall configuration diagram of a system according to another embodiment.

A plurality of embodiments will be described with reference to the drawings. In embodiments, functionally and/or structurally corresponding and/or related parts may be provided with the same reference numerals or with reference numerals that differ by hundreds or more. For corresponding parts and/or related parts, descriptions of other embodiments can be referred to.

<First embodiment>
Hereinafter, a first embodiment embodying a power conversion device according to the present disclosure will be described with reference to the drawings. The power conversion device of this embodiment is installed in a vehicle such as an electric vehicle or a hybrid vehicle, and constitutes an in-vehicle system.

The system includes a power conversion device. As shown in FIG. 1, the power conversion device includes a motor 10, an inverter 20, a high potential electrical path 22H, and a low potential electrical path 22L. The motor 10 is a three-phase synchronous machine, and includes star-connected armature windings 11 of U, V, and W phases, and a rotor (not shown). The armature windings 11 of each phase are arranged to be shifted by 120 degrees in electrical angle. The motor 10 is, for example, a permanent magnet synchronous machine. The rotor is capable of transmitting power to the drive wheels of the vehicle. Therefore, the motor 10 becomes a source of torque that drives the vehicle.

The inverter 20 includes a series connection body of an upper arm switch SWH and a lower arm switch SWL for three phases. An upper arm diode DH, which is a freewheeling diode, is connected antiparallel to the upper arm switch SWH, and a lower arm diode DL, which is a freewheeling diode, is connected antiparallel to the lower arm switch SWL. In this embodiment, each switch SWH, SWL is an IGBT.

The inverter 20 includes a smoothing capacitor 21. The high potential side terminal of the smoothing capacitor 21 is connected to the first end side of the elongated high potential side electrical path 22H. A first end of a long low potential electrical path 22L is connected to the low potential terminal of the smoothing capacitor 21. Note that the smoothing capacitor 21 may be provided outside the inverter 20.

In each phase, the armature winding is connected to the connection point between the emitter, which is the low potential side terminal of the upper arm switch SWH, and the collector, which is the high potential side terminal of the lower arm switch SWL, through a conductive member 23 such as a bus bar. A first end of line 11 is connected. The second ends of the armature windings 11 of each phase are connected at a neutral point. In this embodiment, the armature windings 11 of each phase are set to have the same number of turns. As a result, the armature windings 11 of each phase are set to have the same inductance, for example.

A high potential side electrical path 22H is connected to the collector of the upper arm switch SWH of each phase. A low potential side electrical path 22L is connected to the emitter of the lower arm switch SWL of each phase.

The system includes a first storage battery 31 (corresponding to a "first power storage unit") and a second storage battery 32 (corresponding to a "second power storage unit"). Each of the

storage batteries

31 and 32 serves as a power supply source for rotationally driving the rotor of the motor 10. Each of the

storage batteries

31 and 32 is an assembled battery configured as a series connection of battery cells that are single batteries. The positive terminal of the first storage battery 31 is connected to the high potential side electrical path 22H, and the negative terminal of the second storage battery 32 is connected to the low potential side electrical path 22L. The terminal voltages (for example, rated voltages) of each battery cell that constitute the assembled battery are set to be the same, for example. The battery cell is, for example, a secondary battery such as a lithium ion battery.

Each

storage battery

31, 32 can be charged by an external charger, which will be described later, provided outside the vehicle. The external charger is, for example, a stationary charger. On the second end side of the high potential side electric path 22H, which is opposite to the connection point side of the smoothing capacitor 21, a positive side connection portion to which a positive electrode terminal of an external charger can be connected is provided. A second end of the low-potential electric path 22L opposite to the connection point of the smoothing capacitor 21 is provided with a negative connection portion to which a negative terminal of an external charger can be connected.

The power conversion device includes a main switch for electrically connecting or disconnecting between the first and

second storage batteries

31 and 32 and the inverter 20. Specifically, a high potential side main switch SMRH and a low potential side main switch SMRL are provided as the main switches. Further, the power conversion device includes a charging switch for electrically connecting or disconnecting between the external charger and the first and

second storage batteries

31 and 32. Specifically, a high potential side charging switch DCRH and a low potential side charging switch DCRL are provided as the charging switches. In this embodiment, each switch SMRH, SMRL, DCRH, and DCRL is a mechanical relay. Each of the switches SMRH, SMRL, DCRH, and DCRL blocks bidirectional current flow when turned off, and allows bidirectional current flow when turned on. The high potential side electrical path 22H is provided with a high potential side main switch SMRH and a high potential side charging switch DCRH in this order from the inverter 20 side. The low potential side electrical path 22L is provided with a low potential side main switch SMRL and a low potential side charging switch DCRL in this order from the inverter 20 side. Note that the high potential side main switch SMRH, the low potential side main switch SMRL, the high potential side charging switch DCRH, and the low potential side charging switch DCRL are not limited to mechanical relays, and may be, for example, semiconductor switching elements.

The power conversion device includes an inter-battery switch 40 as a switch for switching the connection state of the first storage battery 31 and the second storage battery 32 to either a state in which they are connected in series to an external charger or a state in which they are connected via a motor. A bypass switch 50 and a motor side switch 60 are provided. In this embodiment, the inter-battery switch 40, the bypass switch 50, and the motor-side switch 60 are mechanical relays. The inter-battery switch 40, the bypass switch 50, and the motor side switch 60 block bidirectional current flow when turned off, and allow bidirectional current flow when turned on. Note that the inter-battery switch 40, the bypass switch 50, and the motor-side switch 60 are not limited to mechanical relays, and may be, for example, semiconductor switching elements.

The inter-battery switch 40 is provided in the inter-battery electrical path 24 (corresponding to the "inter-storage unit electrical path") that connects the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32. By turning on the inter-battery switch 40, the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32 are electrically connected. On the other hand, by turning off the inter-battery switch 40, the negative terminal of the first storage battery 31 and the positive terminal of the second storage battery 32 are electrically disconnected.

The bypass switch 50 connects the negative terminal of the first storage battery 31 and the low potential side electrical path 22L. By turning on the bypass switch 50, the negative terminal of the first storage battery 31 and the negative terminal of the second storage battery 32 are electrically connected. On the other hand, by turning off the bypass switch 50, the negative terminal of the first storage battery 31 and the negative terminal of the second storage battery 32 are electrically disconnected.

The motor-side switch 60 is provided in the motor-side electrical path 25 that connects the inter-battery electrical path 24 closer to the second storage battery 32 than the inter-battery switch 40 and the neutral point of the armature winding 11 . By turning on the motor side switch 60, the neutral point of the armature winding 11 and the positive terminal of the second storage battery 32 are electrically connected. On the other hand, by turning off the motor side switch 60, the neutral point of the armature winding 11 and the positive terminal of the second storage battery 32 are electrically disconnected.

The power conversion device includes a first voltage sensor 71 that detects the voltage between the terminals of the first storage battery 31 and a second voltage sensor 72 that detects the voltage between the terminals of the second storage battery 32. The power conversion device includes a first current sensor 73 that detects the current flowing through the first storage battery 31 and a second current sensor 74 that detects the current flowing through the second storage battery 32. The first current sensor 73 is provided on an electrical path that connects the positive terminal of the first storage battery 31 and the high potential side electrical path 22H. The second current sensor 74 is provided on an electrical path that connects the negative terminal of the second storage battery 32 and the low potential side electrical path 22L. Note that the power conversion device includes, as other sensors, a rotation angle sensor that detects the rotation angle (electrical angle) of the rotor, and a phase current sensor that detects the phase current flowing in the armature winding 11 of each phase. There is.

The detected values of each sensor are input to a control device 100 (corresponding to a "control unit") included in the power conversion device. The control device 100 is mainly configured with a microcomputer 101, and the microcomputer 101 includes a CPU. The functions provided by the microcomputer 101 can be provided by software recorded in a physical memory device and a computer that executes it, only software, only hardware, or a combination thereof. For example, if the microcomputer 101 is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including a large number of logic circuits or an analog circuit. For example, the microcomputer 101 executes a program stored in a non-transitory tangible storage medium, which serves as a storage unit included in the microcomputer 101 . The program includes, for example, a program for processing shown in FIG. 2, which will be described later. By executing the program, a method corresponding to the program is executed. The storage unit is, for example, a nonvolatile memory. Note that the program stored in the storage unit can be updated via a communication network such as the Internet, for example, OTA (Over The Air).

The control device 100 performs switching control of the switches SWH and SWL that constitute the inverter 20 in order to feedback control the control amount of the motor 10 to a command value based on the detected values of each sensor. The controlled amount is, for example, torque. In each phase, the upper arm switch SWH and the lower arm switch SWL are turned on alternately. Through this feedback control, the rotational power of the rotor is transmitted to the drive wheels, and the vehicle runs.

The positive electrode side connection portion of the high potential side electrical path 22H and the negative electrode side connection portion of the low potential side electrical path 22L are interfaces for connection to an external charger. In this embodiment, the external charger is a high voltage charger 200 or a low voltage charger 210 (see FIG. 3). The charging voltage of the high-voltage charger 200 is approximately the same as the voltage (specifically, the rated voltage) between the terminals of the series connection of the first and

second storage batteries

31 and 32, and is, for example, 800V. The charging voltage of the low-voltage charger 210 is lower than the rated voltage of the series connection of the first and

second storage batteries

31 and 32, and is, for example, 400V. For example, when an external charger is connected to each connection part by a user or an operator and the first and

second storage batteries

31 and 32 are charged by the external charger, the high potential side charging switch DCRH and the low potential side charging switch DCRL are , is switched on by the control device 100.

On the other hand, when charging by the external charger is not performed or when the external charger is not connected, the high potential side charging switch DCRH and the low potential side charging switch DCRL are switched off by the control device 100. When the positive electrode side connection portion and the negative electrode side connection portion are exposed to the outside from the casing of the power conversion device, there is a possibility that the positive electrode side connection portion and the negative electrode side connection portion may be touched by a user or an operator. By turning off the high potential side charging switch DCRH and the low potential side charging switch DCRL, occurrence of electric shock is prevented.

Next, the charging process using the external charger will be described using FIG. 2. This process is executed by the control device 100.

In step S10, it is determined whether the external charger connected to each connection part of each

electrical path

22H, 22L is the high voltage charger 200. This process is a process for determining whether or not the connection state of the first and

second storage batteries

31 and 32 is to be connected in series.

If it is determined in step S10 that the external charger is the high voltage charger 200, the process proceeds to step S11, and the first storage battery 31 and the second storage battery 32 are connected in series to the high voltage charger 200. Then, operate the inter-battery switch 40, the bypass switch 50, the motor side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20.

Specifically, the inter-battery switch 40 is turned on, and the bypass switch 50, motor side switch 60, and upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. Thereby, as shown in FIG. 3, the first storage battery 31 and the second storage battery 32 are connected in series to the high voltage charger 200. Therefore, current flows through a closed circuit including the high-voltage charger 200, the high-potential electrical path 22H, the first storage battery 31, the inter-battery switch 40, the second storage battery 32, and the low-potential electrical path 22L, and the first storage battery 31 and The second storage battery 32 is charged while being connected in series. At this time, since the upper arm switch SWH of the inverter 20 and the motor side switch 60 are turned off, the charging current of the high voltage charger 200 can be prevented from flowing to the inverter 20 and the armature winding 11. In addition, in FIG. 3, illustration of each main switch SMRH, SMRL and each charging switch DCRH, DCRL is omitted.

Returning to the explanation of FIG. 2, if it is determined in step S10 that the external charger is not the high voltage charger 200, the process proceeds to step S12, and it is determined whether the connected external charger is the low voltage charger 210. do. This process is a process for determining whether or not the connection state of the first and

second storage batteries

31 and 32 should be set to the motor-via connection state.

If it is determined in step S12 that the external charger is the low-voltage charger 210, the process proceeds to step S13, and the inter-battery switch is set so that the connection state of the first and

second storage batteries

31 and 32 becomes the connection state via the motor. 40, operate the bypass switch 50, the motor side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20. Thereby, the system voltage can be lowered to a voltage equivalent to the charging voltage of the low-voltage charger 210, and countermeasures against ground faults can be taken during charging by the low-voltage charger 210.

Specifically, the inter-battery switch 40 is turned off, and the bypass switch 50 and motor side switch 60 are turned on. Further, the lower arm switches SWL of all phases of the inverter 20 are turned off, and the upper arm switch SWH of at least one phase is turned on. As a result, as shown in FIG. 4, the first storage battery 31 and the second storage battery 32 are connected to the low voltage charger 210 via the motor. Therefore, current flows through a closed circuit including the low-voltage charger 210, the high-potential electric path 22H, the first storage battery 31, the bypass switch 50, and the low-potential electric path 22L, and the first storage battery 31 is charged. In addition, a closed circuit including a low voltage charger 210, a high potential side electrical path 22H, an upper arm switch SWH, an armature winding 11, a neutral point, a motor side switch 60, a second storage battery 32, and a low potential side electrical path 22L is provided. Current flows and the second storage battery 32 is charged. Note that in step S13, when the multi-phase upper arm switch SWH is turned on, the impedance of the charging path can be reduced.

Through the process of step S13, the connection state of the first and

second storage batteries

31 and 32 can be changed to the motor-via connection state. Thereby, the first storage battery 31 can be directly charged by the low voltage charger 210, and the second storage battery 32 can be charged via the inverter 20 and the armature winding 11. Furthermore, even when the rated voltages of the first and

second storage batteries

31 and 32 are different, or when the actual terminal voltages of the first and

second storage batteries

31 and 32 with the same rated voltage are different, the first , the

second storage batteries

31 and 32 can be charged simultaneously without an additional power conversion circuit.

According to the present embodiment described in detail above, a configuration in which the system voltage is lowered in response to the charging voltage of the low-voltage charger 210 can be realized by reusing part of the configuration of the inverter 20 and the motor 10. Therefore, it is possible to provide a power conversion device with a simplified configuration for switching the connection state of the first and

second storage batteries

31 and 32.

<Modified example of the first embodiment>
- In step S11 of FIG. 2, at least one phase of the upper arm switch SWH and the motor side switch 60 may be turned on, provided that the in-phase upper and lower arm switches SWH and SWL of the inverter 20 are not turned on. Further, in step S11, switching may be performed to repeatedly turn on and off one of the upper and lower arm switches SWH and SWL of the same phase, or switching may be performed to alternately turn on the upper and lower arm switches SWH and SWL of the same phase. It's okay.

- In step S13, the upper arm switch SWH is not limited to being kept on, but may be repeatedly turned on and off, or the upper and lower arm switches SWH and SWL may be alternately turned on in at least one phase. It's okay. In this case, for example, based on the detected electrical angle value, the torque of the motor 10 is 0 or a value near 0 (specifically, for example, the q-axis current flowing through the armature winding 11 is 0 or a value near 0). Switching may be performed so that

- After the determination in step S12 is affirmative, the voltage across the terminals of the first storage battery 31 detected by the first voltage sensor 71 (hereinafter referred to as first detection voltage VA) is the voltage of the second storage battery 32 detected by the second voltage sensor 72. If it is determined that the inter-terminal voltage (hereinafter referred to as second detected voltage VB) is higher than or equal to the terminal voltage, the process of step S13 may be performed. Further, after the determination in step S12 is affirmative, the second detection voltage VB is higher than the first detection voltage VA, and the value obtained by subtracting the first detection voltage VA from the second detection voltage VB is the threshold value ΔVjde (>0. If it is determined that the second threshold value ΔVjde2 is equal to or less than the second threshold value ΔVjde2, the process of step S13 may be performed. As a result, when the operation state of each switch is changed as in step S13, the second storage battery 32 is connected to the motor side electrical path 25, the armature winding 11, the upper arm diode DH, and the high potential side electrical path 22H. It is possible to suppress the occurrence of a phenomenon in which current flows into the 1 storage battery 31, or to reduce the amount of current that flows even if this phenomenon occurs.

Note that the threshold value ΔVjde is a value smaller than the rated voltage of each

storage battery

31, 32. The threshold value ΔVjde is set, for example, to a value of 1/10 or less, 1/20 or less, 1/50 or less, or 1/100 or less of the lower of the rated voltages of each

storage battery

31, 32. has been done. A situation where the second detection voltage VB and the first detection voltage VA are significantly different may occur, for example, in the following cases (1) to (3).

(1) In a configuration in which the rated voltages of the battery cells constituting each

storage battery

31 and 32 are the same, the number of battery cells constituting the first storage battery 31 and the number of battery cells constituting the second storage battery 32 are different.

(2) In a configuration where the number of battery cells constituting each

storage battery

31, 32 is the same, the types of each

storage battery

31, 32 are different and the rated voltages of the battery cells of each

storage battery

31, 32 are different.

(3) A case where the number of battery cells configuring each

storage battery

31, 32 is different, the type of each

storage battery

31, 32 is different, and the rated voltage of the battery cell of each

storage battery

31, 32 is different.

<Second embodiment>
The second embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, as shown in FIG. 5, the bypass switch 51 connects the positive terminal of the second storage battery 32 and the high potential side electrical path 22H. Further, the motor side switch 61 connects the negative terminal of the first storage battery 31 and the neutral point of the armature winding 11.

FIG. 6 shows the procedure of the charging control process of this embodiment executed by the control device 100.

If it is determined in step S10 that the external charger is the high voltage charger 200, the process proceeds to step S14, and the first storage battery 31 and the second storage battery 32 are connected in series to the high voltage charger 200. Then, the inter-battery switch 40 is turned on, and the bypass switch 51, motor side switch 61, and upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. Thereby, the first storage battery 31 and the second storage battery 32 are connected in series to the high-voltage charger 200, and the first storage battery 31 and the second storage battery 32 are charged while being connected in series.

If it is determined in step S12 that the external charger is the low-voltage charger 210, the process advances to step S15, and the connection state of the first storage battery 31 and the second storage battery 32 to the low-voltage charger 210 changes to the connection state via the motor. The inter-battery switch 40 is turned off, the bypass switch 51 and the motor side switch 61 are turned on, the lower arm switches SWL of all phases of the inverter 20 are turned off, and the upper arm switch SWH of at least one phase is turned on. As a result, the connection state of the first storage battery 31 and the second storage battery 32 to the low-voltage charger 210 becomes the connection state via the motor, and the first storage battery 31 and the second storage battery 32 are charged.

<Modified example of second embodiment>
- In step S14 of FIG. 6, at least one phase of the lower arm switch SWL and the motor side switch 61 may be turned on, provided that the in-phase upper and lower arm switches SWH and SWL of the inverter 20 are not turned on. Further, in step S14, switching may be performed to repeatedly turn on and off one of the upper and lower arm switches SWH and SWL of the same phase, or switching may be performed to alternately turn on the upper and lower arm switches SWH and SWL of the same phase. It's okay.

- In step S15, the lower arm switch SWL is not limited to being kept on, but may be repeatedly turned on and off, or the upper and lower arm switches SWH and SWL may be alternately turned on in at least one phase. It's okay.

- After making an affirmative determination in step S12, if it is determined that the second detection voltage VB is greater than or equal to the first detection voltage VA, the process in step S15 may be performed. Further, after the determination in step S12 is affirmative, it is determined that the first detection voltage VA is higher than the second detection voltage VB, and the value obtained by subtracting the second detection voltage VB from the first detection voltage VA is less than or equal to the threshold value ΔVjde. In this case, the process of step S15 may be performed.

<Third embodiment>
The third embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, as shown in FIG. 7, a bypass switch 80 that connects the positive terminal of the second storage battery 32 and the high potential side electrical path 22H is further provided. In this embodiment, the bypass switch 80 will be referred to as a second bypass switch 80, and the bypass switch 50 will be referred to as a first bypass switch 50.

FIG. 8 shows the procedure of the charging control process of this embodiment executed by the control device 100.

In step S20, similarly to step S10, it is determined whether the external charger is the high voltage charger 200.

If it is determined in step S20 that the external charger is the high voltage charger 200, the process proceeds to step S21, and the first storage battery 31 and the second storage battery 32 are connected in series to the high voltage charger 200. Then, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 60, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated.

Specifically, the inter-battery switch 40 is turned on, and the first bypass switch 50, second bypass switch 80, motor side switch 60, and upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. Thereby, the first storage battery 31 and the second storage battery 32 are connected in series to the high-voltage charger 200, and the first storage battery 31 and the second storage battery 32 are connected in series and are charged.

If it is determined in step S20 that the external charger is not the high voltage charger 200, the process proceeds to step S22, and similarly to step S12, it is determined whether the external charger is the low voltage charger 210.

If it is determined in step S22 that the external charger is the low-voltage charger 210, the process proceeds to step S23, and the absolute value of the difference between the first detection voltage VA and the second detection voltage VB is determined to be the first threshold value ΔVjde1 (> 0) Determine whether or not.

If it is determined in step S23 that the absolute value of the difference is less than or equal to the first threshold value ΔVjde1, the process proceeds to step S24, where the first storage battery 31 and the second storage battery 32 are each connected in parallel to the low-voltage charger 210. Operate the inter-battery switch 40, first bypass switch 50, second bypass switch 80, motor side switch 60, and upper and lower arm switches SWH and SWL of the inverter 20 so that

Specifically, the inter-battery switch 40 and the motor side switch 60 are turned off, and the first bypass switch 50 and the second bypass switch 80 are turned on. Also, all phase upper and lower arm switches SWH and SWL of the inverter 20 are turned off. Thereby, as shown in FIG. 10, the first storage battery 31 and the second storage battery 32 are connected in parallel to the low-voltage charger 210. Therefore, current flows through a closed circuit including the low-voltage charger 210, the high-potential electric path 22H, the first storage battery 31, the first bypass switch 50, and the low-potential electric path 22L, and the first storage battery 31 is charged. Further, a current flows through a closed circuit including the low voltage charger 210, the high potential side electrical path 22H, the second bypass switch 80, the second storage battery 32, and the low potential side electrical path 22L, and the second storage battery 32 is charged. At this time, since the potential difference between the first and

second storage batteries

31 and 32 is small, it is possible to suppress the occurrence of a phenomenon in which current flows from one of the first and

second storage batteries

31 and 32 to the other, and to prevent this phenomenon from occurring. However, the amount of current that flows can be reduced.

Returning to the explanation of FIG. 8, if it is determined in step S23 that the absolute value of the difference exceeds the first threshold value ΔVjde1, the process proceeds to step S25, and the value obtained by subtracting the first detected voltage VA from the second detected voltage VB is determined. is equal to or less than a second threshold value ΔVjde2 (>0), which is larger than the first threshold value ΔVjde1. If it is determined in step S25 that "VB-VA>ΔVjde2", charging by the low-voltage charger 210 is prohibited in the state where the first and

second storage batteries

31 and 32 are connected via the motor and in the state where they are connected in parallel. The situation in which it is determined in step S25 that "VB-VA>ΔVjde2" is such that the second detection voltage VB is higher than the first detection voltage VA and the potential difference between the second detection voltage VB and the first detection voltage VA is 2 threshold value ΔVjde2 is exceeded. Note that the first threshold value ΔVjde1 is, for example, the impedance of the current path existing between the first storage battery 31 and the second storage battery 32 (specifically For example, the maximum value and steady-state value of the inrush current determined from the relationship between the impedance of the first and

second storage batteries

31 and 32 and the potential difference between the first storage battery 31 and the second storage battery 32 are allowable. The potential difference between the first storage battery 31 and the second storage battery 32 may be set to be equal to or less than the value. In addition, the second threshold value ΔVjde2 is, for example, when the connection state of the first and

second storage batteries

31 and 32 is set to the motor-via connection state. (specifically, for example, the impedance of the first and

second storage batteries

31 and 32, the impedance of the inverter 20 and the armature winding 11, and the forward direction impedance of the diode of the inverter 20), If the potential difference between the first storage battery 31 and the second storage battery 32 is set to such that the maximum value and steady-state value of the rush current determined from the relationship between the "potential difference between the storage battery 31 and the second storage battery 32" are below the allowable value. good. Here, the above-mentioned allowable value is, for example, the maximum current that components on the current path can withstand for safety.

On the other hand, if it is determined in step S25 that "VB-VA≦ΔVjde2", the process advances to step S26. The situation in which it is determined that "VB-VA≦ΔVjde2" in step S25 is such that the first detection voltage VA becomes higher than the second detection voltage VB and the potential difference between the second detection voltage VB and the first detection voltage VA exceeds the first threshold value ΔVjde1, or the second detection voltage VB becomes higher than the first detection voltage VA, and the potential difference between the second detection voltage VB and the first detection voltage VA is larger than the first threshold value ΔVjde1. This is a situation in which the second threshold value ΔVjde2 is also lower than the second threshold value ΔVjde2. In step S26, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 60, and the inverter 20 are connected so that the first storage battery 31 and the second storage battery 32 are connected to each other through the motor. Operate the upper and lower arm switches SWH and SWL.

Specifically, the inter-battery switch 40 and the second bypass switch 80 are turned off, and the first bypass switch 50 and the motor side switch 60 are turned on. Further, the lower arm switches SWL of all phases of the inverter 20 are turned off, and the upper arm switch SWH of at least one phase is turned on. Thereby, as shown in FIG. 9, the connection state of the first storage battery 31 and the second storage battery 32 becomes the motor-via connection state. Therefore, a current flows through a closed circuit including the low-voltage charger 210, the high-potential electric path 22H, the first storage battery 31, the first bypass switch 50, and the low-potential electric path 22L, and the first storage battery 31 is charged. In addition, a closed circuit including a low voltage charger 210, a high potential side electrical path 22H, an upper arm switch SWH, an armature winding 11, a neutral point, a motor side switch 60, a second storage battery 32, and a low potential side electrical path 22L is provided. Current flows and the second storage battery 32 is charged. At this time, it is possible to suppress the occurrence of a phenomenon in which current flows from the second storage battery 32 to the first storage battery 31 via the motor side electrical path 25, the armature winding 11 upper arm diode DH, and the high potential side electrical path 22H. Even if a phenomenon occurs, the amount of current flowing can be reduced.

<Modification of third embodiment>
The process of step S25 in FIG. 8 may be omitted and the process of step S26 may be performed when the answer is affirmative in step S23. Furthermore, in step S26, the upper arm switch SWH is not limited to being kept on, but may be repeatedly turned on and off, or alternatively the upper and lower arm switches SWH and SWL may be alternately turned on in at least one phase. You may go.

<Fourth embodiment>
The fourth embodiment will be described below with reference to the drawings, focusing on the differences from the third embodiment. In this embodiment, as shown in FIG. 11, the motor-side electrical path 25 in which the motor-side switch 61 is provided is located between the neutral point of the armature winding 11 and the inter-battery electrical path 24 that is closer to the inter-battery switch 40. The first storage battery 31 side is connected.

FIG. 12 shows the procedure of the charging control process of this embodiment executed by the control device 100.

If it is determined in step S20 that the external charger is the high voltage charger 200, the process advances to step S26, and the first storage battery 31 and the second storage battery 32 are connected in series to the high voltage charger 200. Then, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated.

Specifically, the inter-battery switch 40 is turned on, and the first bypass switch 50, second bypass switch 80, motor side switch 61, and upper and lower arm switches SWH and SWL of all phases of the inverter 20 are turned off. Thereby, the first storage battery 31 and the second storage battery 32 are charged in a state where the first storage battery 31 and the second storage battery 32 are connected in series to the high-voltage charger 200 .

If it is determined in step S22 that the external charger is the low voltage charger 210, the process advances to step S23. If it is determined in step S23 that the absolute value of the difference between the first detection voltage VA and the second detection voltage VB is less than or equal to the first threshold value ΔVjde1, the process advances to step S27. In step S27, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, and the motor are connected so that the first storage battery 31 and the second storage battery 32 are connected in parallel to the low-voltage charger 210. Operate the side switch 61 and the upper and lower arm switches SWH and SWL of the inverter 20.

Specifically, the inter-battery switch 40 and the motor side switch 61 are turned off, and the first bypass switch 50 and the second bypass switch 80 are turned on. Also, all phase upper and lower arm switches SWH and SWL of the inverter 20 are turned off. Thereby, the first and

second storage batteries

31 and 32 are charged in a state where the first and

second storage batteries

31 and 32 are connected in parallel to the low voltage charger 210. At this time, since the potential difference between the first and

second storage batteries

If a negative determination is made in step S23, the process proceeds to step S28, and it is determined whether the value obtained by subtracting the second detection voltage VB from the first detection voltage VA is less than or equal to the second threshold value ΔVjde2. If it is determined in step S28 that "VA-VB>ΔVjde2", charging by the low-voltage charger 210 is prohibited when the first and

second storage batteries

31 and 32 are connected via the motor and connected in parallel. The situation in which it is determined in step S28 that "VA-VB>ΔVjde2" is such that the first detection voltage VA is higher than the second detection voltage VB and the potential difference between the second detection voltage VB and the first detection voltage VA is 2 threshold value ΔVjde2 is exceeded.

On the other hand, if it is determined in step S28 that "VA-VB≦ΔVjde2", the process advances to step S29. The situation in which it is determined in step S28 that "VA-VB≦ΔVjde2" is such that the second detection voltage VB is higher than the second detection voltage VA, and the potential difference between the second detection voltage VB and the first detection voltage VA is exceeds the first threshold ΔVjde1, or the first detection voltage VB becomes higher than the second detection voltage VB, and the potential difference between the second detection voltage VB and the first detection voltage VA is larger than the first threshold ΔVjde1. This is a situation in which the second threshold value ΔVjde2 is also lower than the second threshold value ΔVjde2. In step S29, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, the motor side switch 61, and the inverter 20 are connected so that the first storage battery 31 and the second storage battery 32 are connected to each other through the motor. Operate the upper and lower arm switches SWH and SWL.

Specifically, the inter-battery switch 40 and the first bypass switch 50 are turned off, and the second bypass switch 80 and the motor side switch 61 are turned on. Further, the upper arm switches SWH of all phases of the inverter 20 are turned off, and the lower arm switch SWL of at least one phase is turned on. Thereby, the connection state of the first and

second storage batteries

31 and 32 to the low voltage charger 210 becomes the motor-via connection state, and the first and

second storage batteries

31 and 32 are charged. At this time, it is possible to suppress the occurrence of a phenomenon in which current flows from the first storage battery 31 to the second storage battery 32, or to reduce the amount of current flowing even if this phenomenon occurs.

<Modification of the fourth embodiment>
The process of step S28 in FIG. 12 may be omitted and the process of step S29 may be performed when the answer is affirmative in step S23. Further, in step S29, the lower arm switch SWL is not limited to being kept on, but may be repeatedly turned on and off, or the upper and lower arm switches SWH and SWL may be alternately turned on in at least one phase. You may go.

<Fifth embodiment>
The fifth embodiment will be described below with reference to the drawings, focusing on the differences from the fourth embodiment. In this embodiment, as shown in FIG. 13, in addition to a switch connecting the neutral point of the armature winding 11 and the negative terminal of the first storage battery 31, the motor side switch includes a switch connecting the neutral point of the armature winding 11 and the negative terminal of the first storage battery 31; A switch is provided to connect the point and the positive terminal of the second storage battery 32.

The first end of the common path 26 is connected to the neutral point of the armature winding 11. A first end of a first electrical path 27 is connected to the second end of the common path 26, and a second storage battery is connected to the second end of the inter-battery electrical path 24 rather than the inter-battery switch 40. 32 side is connected. Further, a first end of a second electrical path 28 is connected to the second end of the common path 26, and a second end of the second electrical path 28 is connected to a second end of the inter-battery electrical path 24 that is lower than the inter-battery switch 40. 1 storage battery 31 side is connected. In this embodiment, the common path 26 and the first electrical path 27 correspond to the "first motor side electrical path", and the common path 26 and the second electrical path 28 correspond to the "second motor side electrical path". Note that the common path 26 may not be provided, and the first ends of the first electrical path 27 and the second electrical path 28 may be connected to the neutral point of the armature winding 11.

A first motor side switch 60 is provided on the first electrical path 27. A second motor side switch 61 is provided on the second electrical path 28 .

FIG. 14 shows the procedure of the charging control process of this embodiment executed by the control device 100.

If it is determined in step S20 that the external charger is the high voltage charger 200, the process proceeds to step S30, and the first storage battery 31 and the second storage battery 32 are connected in series to the high voltage charger 200. , turn on the inter-battery switch 40 and turn off the first bypass switch 50, second bypass switch 80, first motor side switch 60, second motor side switch 61, and upper and lower arm switches SWH and SWL of the inverter 20. . Thereby, the first storage battery 31 and the second storage battery 32 are charged in a state where the first storage battery 31 and the second storage battery 32 are connected in series to the high-voltage charger 200 .

If it is determined in step S22 that the external charger is the low voltage charger 210, the process advances to step S23. If it is determined in step S23 that the absolute value of the difference between the first detection voltage VA and the second detection voltage VB is less than or equal to the first threshold value ΔVjde1, the process proceeds to step S31. In step S31, the inter-battery switch 40, the first bypass switch 50, the second bypass switch 80, and the The first motor side switch 60, the second motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated.

Specifically, the inter-battery switch 40, the first motor side switch 60, and the second motor side switch 61 are turned off, and the first bypass switch 50 and the second bypass switch 80 are turned on. Also, all phase upper and lower arm switches SWH and SWL of the inverter 20 are turned off. Thereby, the first and

second storage batteries

31 and 32 are charged in a state where the first and

second storage batteries

If a negative determination is made in step S23, the process proceeds to step S34, and it is determined which of the first detection voltage VA and the second detection voltage VB is higher. If it is determined in step S34 that "VA>VB", the process proceeds to step S32, and the inter-battery switch 40 is set so that the first storage battery 31 and the second storage battery 32 are connected to each other via the first motor. , the first bypass switch 50, the second bypass switch 80, the first motor side switch 60, the second motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20.

Specifically, the inter-battery switch 40, the second motor side switch 61, and the second bypass switch 80 are turned off, and the first bypass switch 50 and the first motor side switch 60 are turned on. Further, the lower arm switches SWL of all phases of the inverter 20 are turned off, and the upper arm switch SWH of at least one phase is turned on. As a result, the first and

second storage batteries

31 and 32 are charged. At this time, since the potential difference between the first and

second storage batteries

31 and 32 is small, it is possible to suppress the occurrence of a phenomenon in which current flows from the second storage battery 32 to the first storage battery 31, and even if this phenomenon occurs, the amount of current that flows You can make it smaller.

On the other hand, if it is determined in step S34 that "VB>VA", the process proceeds to step S33, and the battery is connected so that the first storage battery 31 and the second storage battery 32 are connected to each other via the second motor. The switch 40, the first bypass switch 50, the second bypass switch 80, the first motor side switch 60, the second motor side switch 61, and the upper and lower arm switches SWH and SWL of the inverter 20 are operated.

Specifically, the inter-battery switch 40, the first motor side switch 60, and the first bypass switch 50 are turned off, and the second bypass switch 80 and the second motor side switch 61 are turned on. Further, the upper arm switches SWH of all phases of the inverter 20 are turned off, and the lower arm switch SWL of at least one phase is turned on. As a result, the first and

second storage batteries

31 and 32 is small, the occurrence of a phenomenon in which current flows from the first storage battery 31 to the second storage battery 32 is suppressed, and even if this phenomenon occurs, the amount of current that flows You can make it smaller.

According to the present embodiment described above, the flow of current from one of the first and

second storage batteries

31 and 32 to the other is prevented, regardless of the magnitude relationship between the voltages between the terminals of the first storage battery 31 and the second storage battery 32. It can be suppressed or the amount of current flowing can be reduced. Note that in step S32 of FIG. 14, the upper arm switch SWH is not limited to being kept on, but switching may be performed repeatedly to turn on and off, or the upper and lower arm switches SWH and SWL may be alternately turned on in at least one phase. Switching may also be performed. Further, in step S33, the lower arm switch SWL is not limited to being kept on, but may be repeatedly turned on and off, or the upper and lower arm switches SWH and SWL may be alternately turned on in at least one phase. You may go.

<Sixth embodiment>
The sixth embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, in the charging process when the low voltage charger 210 is connected, switching is performed in which the upper arm switch SWH included in the charging path of the second storage battery 32 is repeatedly turned on and off. In this case, high frequency current is generated due to switching. In this embodiment, as shown in FIG. 15, the power conversion device is equipped with a capacitor 90 that suppresses high-frequency current generated due to switching from flowing from the inverter 20 side to the second storage battery 32 and the low-voltage charger 210. There is.

Of the motor-side electrical path 25, a part of the low-potential-side electrical path 22L (corresponding to the "target path") is connected to the neutral point side of the motor-side switch 60 via a series connection of a connection switch 91 and a capacitor 90. A portion between the low potential side main switch SMRL and the low potential side charging switch DCRL is connected. The connection switch 91 may be a mechanical relay or a semiconductor switching element.

The control device 100 turns off the connection switch 91 during switching control of the inverter 20 for driving the vehicle. Thereby, when controlling the control amount of the motor 10 to the command value, it is possible to suppress the control from being adversely affected.

On the other hand, the control device 100 turns on the connection switch 91, for example, during the charging process by the low-voltage charger 210 in step S13 in FIG. 2 above. Thereby, when current flows through the motor-side electrical path 25, noise or ripple included in the current flowing through the motor-side electrical path 25 can be caused to flow through the capacitor 90. On the other hand, for example, during the charging process by the high voltage charger 200 in step S11, the connection switch 91 is turned off. This is because the inverter 20 is not switched during the charging process by the high voltage charger 200.

According to the embodiment described above, during the charging process by the low voltage charger 210, it is possible to suppress the high frequency current generated due to switching from flowing from the inverter 20 side to the second storage battery 32 and the low voltage charger 210.

<Modified example of the sixth embodiment>
- The capacitor 90 may be connected to the motor side electric path 25 side, and the connection switch 91 may be connected to the low potential side electric path 22L side.

・The connection switch 91 may not be provided. That is, the motor side electrical path 25 and the low potential side electrical path 22L may be always connected.

- As shown in FIG. 16, the series connection body of the connection switch 92 and the capacitor 90 is connected to the part of the motor side electrical path 25 closer to the second storage battery 32 than the motor side switch 60, and to the low potential side electrical path 22L. may be connected.

Furthermore, in the configuration shown in FIG. 16, the connection switch 92 may not be provided. That is, the motor side electrical path 25 and the low potential side electrical path 22L may be always connected.

- As shown in FIG. 17, a plurality of capacitors may be provided. Specifically, a connection switch 93 is provided in the motor-side electrical path 25 closer to the neutral point than the motor-side switch 60 . A high potential side electrical path 22H (corresponding to a "target path") is connected to a portion of the motor side electrical path 25 between the motor side switch 60 and the connection switch 93 via a first capacitor 93A, and A low potential side electrical path 22L (corresponding to a "target path") is connected via a second capacitor 93B.

Furthermore, in the configuration shown in FIG. 17, either the first capacitor 93A or the second capacitor 93B may be omitted.

- As shown in FIG. 18, the first end of the connection switch 94 is connected to the neutral point side of the motor side electrical path 25 rather than the motor side switch 60, and the first capacitor 93A is connected to the second end of the connection switch 94. and a second capacitor 93B may be connected.

<Seventh embodiment>
The seventh embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. As shown in FIG. 19, a series connection body of a precharge switch SP and a resistor 95 is connected in parallel to the motor side switch 60. Note that in FIG. 19, illustration of the control device 100 and the like is omitted for convenience.

The control device 100 performs a precharge process to charge the smoothing capacitor 21, for example, when starting up the power conversion device. In this embodiment, even if an abnormality occurs in either the first storage battery 31 or the second storage battery 32 and the battery becomes unusable, the precharge process can be performed using the remaining storage battery.

First, a case where an abnormality occurs in the second storage battery 32 will be described using FIG. 20. In this case, the control device 100 turns on the high potential side main switch SMRH, the precharge switch SP, and the inter-battery switch 40, and turns off the low potential side main switch SMRL, the motor side switch 60, and the bypass switch 50. Further, the control device 100 turns off all phase upper and lower arm switches SWH and SWL of the inverter 20. Thereby, the smoothing capacitor 21 can be charged by the first storage battery 31.

Next, a case where an abnormality occurs in the first storage battery 31 will be described using FIG. 21. In this case, the control device 100 turns on the low potential side main switch SMRL and the precharge switch SP, and turns off the high potential side main switch SMRH, the motor side switch 60, the inter-battery switch 40, and the bypass switch 50. Further, the control device 100 turns off all phase upper and lower arm switches SWH and SWL of the inverter 20. Thereby, the smoothing capacitor 21 can be charged by the second storage battery 32.

<Eighth embodiment>
The eighth embodiment will be described below with reference to the drawings, focusing on the differences from the sixth and seventh embodiments. In this embodiment, as shown in FIG. 22, a connection switch 93 and a capacitor 90 are provided. A first end of a capacitor 90 is connected to a portion of the motor-side electrical path 25 between the connection point with the precharge switch SP and the connection switch 92 . The second end of the capacitor 90 is connected to the inverter 20 side of the low potential side electrical path 22L rather than the low potential side main switch SMRL.

The control device 100 can charge the smoothing capacitor 21 and the capacitor 90 at the same time in the precharging process of charging the smoothing capacitor 21. Specifically, as shown in FIG. 23, the control device 100 turns on the high potential side main switch SMRH, the precharge switch SP, and the inter-battery switch 40, and turns on the low potential side main switch SMRL, the motor side switch 60, and the bypass switch 50. Turn off. Further, the control device 100 turns off all phase upper and lower arm switches SWH and SWL of the inverter 20.

<Modified example of the eighth embodiment>
As shown in FIG. 24, a series connection of the precharge switch SP and the resistor 95 may be connected in parallel to the low potential side main switch SMRL.

<Other embodiments>
Note that each of the above embodiments may be modified and implemented as follows.

- The circuit configuration of the power conversion device of each of the above embodiments can be modified as shown in (A) to (J) below, for example.

(A) As shown in FIG. 25, the motor side switch 60 may not be provided in the configuration shown in FIG.

(B) As shown in FIG. 26, the motor side switch 61 may not be provided in the configuration shown in FIG.

(C) As shown in FIG. 27, the motor side switch 60 may not be provided in the configuration shown in FIG.

(D) As shown in FIG. 28, the motor side switch 61 may not be provided in the configuration shown in FIG. 11.

(E) As shown in FIG. 29, the first motor side switch 60 may not be provided in the configuration shown in FIG. 13. In this case, if a negative determination is made in step S34 of FIG. 14, charging by the low-voltage charger 210 in the state of connection via the motor may be prohibited.

(F) As shown in FIG. 30, the second motor side switch 61 may not be provided in the configuration shown in FIG. 13. In this case, if an affirmative determination is made in step S34 of FIG. 14, charging by the low-voltage charger 210 in the state of connection via the motor may be prohibited.

(G) As shown in FIG. 31, the first motor side switch 60 and the second bypass switch 80 may not be provided in the configuration shown in FIG. 13.

(H) As shown in FIG. 32, the second bypass switch 80 may not be provided in the configuration shown in FIG. 13.

(I) As shown in FIG. 33, the second motor side switch 61 and the first bypass switch 50 may not be provided in the configuration shown in FIG.

(J) As shown in FIG. 34, the first bypass switch 50 may not be provided in the configuration shown in FIG. 13.

- As shown in FIG. 35, the positive terminal of the first storage battery 31 and the high potential side electrical path 22H may be connected by the first fuse 110A. Further, the negative terminal of the second storage battery 32 and the low potential side electrical path 22L may be connected by a second fuse 110B.

- As shown in FIG. 36, a third current sensor 75 may be provided in a portion of the high potential side electrical path 22H between the connection point with the first storage battery 31 and the high potential side charging switch DCRH. Further, the fourth current sensor 76 can be provided at any position on the motor-side electrical path 25. For example, the fourth current sensor 76 may be provided on the neutral point side of the motor-side electrical path 25 with respect to the motor-side switch 60. It may be. Here, it is sufficient that at least two or more current sensors among the first to fourth current sensors 73 to 76 are provided. This makes it possible to control charging of each

storage battery

31, 32 using as few current sensors as possible. Further, a current sensor that detects the current flowing through each conductive member 23 may be provided, and the total value of the detected value of the current flowing through each conductive member 23 may be used instead of the detected value of the fourth current sensor.

- The connection destination of the motor-side electrical path 25 is not limited to the neutral point of the armature winding 11, but may be the intermediate portion of the armature winding 11, as shown in FIG. 37, for example.

Furthermore, the connection destination of the motor-side electrical path 25 may be a conductive member 23, as shown in FIG. 38, for example. In this case, in the charging process by the low-voltage charger 210, as shown in FIG. All you have to do is turn off the arm switch SWL.

- As shown in FIG. 40, the high potential side charging switch DCRH and the positive electrode side connection part are provided on the side opposite to the first storage battery 31 side with respect to the inverter 20 in the high potential side electrical path 22H, and the low potential side electrical path 22H A low potential side charging switch DCRL and a negative electrode side connection portion may be provided on the opposite side of the path 22L from the second storage battery 32 side with respect to the inverter 20.

- As shown in FIG. 41, one end of the capacitor 90 may be connected to the second storage battery 32 side of the motor side electrical path 25 rather than the motor side switch 60. In this case, a connection switch is not required.

・Each main switch SMRH, SMRL, each charging switch DCRH, DCRL, inter-battery switch 40, bypass switch, motor side switch, and connection switch are not limited to one switch, but can be multiple switches connected in series. It may be composed of a connection body or a parallel connection body of a plurality of switches.

- The switch of the inverter 20 is not limited to an IGBT, but may be an N-channel MOSFET including a body diode, for example. In this case, the high potential side terminal of the N-channel MOSFET becomes the drain, and the low potential side terminal becomes the source.

・The motor is not limited to a star-connected motor, but may be a delta-connected motor. Further, the motor and inverter are not limited to three-phase motors, but may be two-phase motors or four-phase motors or more. Further, the motor is not limited to a permanent magnet type synchronous machine having a permanent magnet as a field pole on the rotor, but may be a wound field type synchronous machine having a field winding as a field pole on the rotor. In this case, the rotor may be equipped with both field windings and permanent magnets. Further, the motor is not limited to a synchronous machine, but may be an induction machine.

- The power storage unit to be charged by the external charger is not limited to a storage battery, but may be, for example, a large-capacity electric double layer capacitor, or one that includes both a storage battery and an electric double layer capacitor.

- The moving object on which the power conversion device is mounted is not limited to a vehicle, but may be an aircraft or a ship, for example. Furthermore, the power converter device is not limited to a mobile object, but may be a stationary device.

- The control unit and the method described in the present disclosure are implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. May be realized. Alternatively, the controller and techniques described in this disclosure may be implemented by a dedicated computer provided by a processor configured with one or more dedicated hardware logic circuits. Alternatively, the control unit and the method described in the present disclosure may be implemented using a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. It may be implemented by one or more dedicated computers configured. The computer program may also be stored as instructions executed by a computer on a computer-readable non-transitory tangible storage medium.

- Characteristic configurations extracted from each of the embodiments described above will be described below.
[Configuration 1]
a high potential side electrical path (22H) electrically connectable to the positive terminal of the first power storage unit (31);
a low potential side electrical path (22L) electrically connectable to the negative terminal of the second power storage unit (32);
an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path, and a lower arm switch (SWL) electrically connected to the low potential side electrical path;
a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23);
In a power conversion device comprising:
an inter-power storage unit switch (40) provided in an inter-power storage unit electrical path (24) that electrically connects the negative terminal of the first power storage unit and the positive terminal of the second power storage unit;
At least one of the electrical connection between the negative terminals of the first power storage unit and the second power storage unit, and the electrical connection between the positive terminals of the first power storage unit and the second power storage unit Bypass switches (50, 51) for making a connection,
a motor-side electrical path (25 to 28) that electrically connects the armature winding or the conductive member and the inter-power storage unit electrical path;
A power conversion device comprising:
[Configuration 2]
The bypass switch (50) is a switch that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit,
The motor-side electrical path (25) is a path that electrically connects the armature winding to the second power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch,
The power conversion device according to configuration 1, including a motor-side switch (60) provided in the motor-side electrical path.
[Configuration 3]
The first power storage unit and the second power storage unit may be connected in series, or the positive terminal of the second power storage unit may be connected to the high potential through the motor-side electrical path, the armature winding, and the inverter. A control unit (100) that determines whether the motor is connected to the side electrical path or the motor-via connection state is selected.
The control unit includes:
When it is determined that the first power storage unit and the second power storage unit are connected to each other in the series connection state, the inter-power storage unit switch is turned on and the bypass switch is turned off;
On the condition that the connection state of the first power storage unit and the second power storage unit is determined to be the connection state via the motor, the inter-power storage unit switch is turned off, and the bypass switch and the motor side switch are turned on. , the power conversion device according to Configuration 2.
[Configuration 4]
The bypass switch is a first bypass switch (50),
The power conversion device according to configuration 2, comprising a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit.
[Configuration 5]
The connection state of the first power storage unit and the second power storage unit may be a series connection state, a parallel connection state, or a positive terminal of the second power storage unit may be connected to the motor side electrical path, the armature winding, and the inverter. a control unit (100) that determines whether the motor is connected to the high potential side electric path or the motor-via connection state;
The control unit includes:
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the inter-power storage unit switch is turned on, and the first bypass switch and the second bypass switch are turned off,
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, performing a first operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the motor, performing a second operation;
The first operation is an operation of turning off the inter-power storage unit switch and the motor side switch, and turning on the first bypass switch and the second bypass switch,
The second operation is an operation of turning off the power storage unit switch and the second bypass switch, turning on the first bypass switch and the motor side switch, and operating the switch of the inverter,
The switch operation of the inverter is an operation of turning off the lower arm switch of each phase and turning on the upper arm switch of at least one phase, or at least one operation on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. The power conversion device according to configuration 4, wherein the operation is to repeatedly turn on and off the upper arm switch of a phase.
[Configuration 6]
The control unit includes:
The connection state of the first power storage unit and the second power storage unit is determined to be the parallel connection state, and the potential difference between the first power storage unit and the second power storage unit is equal to or less than a first threshold value (ΔVjde1). If it is determined that there is, perform the first operation,
The connection state of the first power storage unit and the second power storage unit is determined to be the connection state via the motor, and the value obtained by subtracting the voltage of the first power storage unit from the voltage of the second power storage unit is The power converter device according to configuration 5, wherein the second operation is performed when it is determined that the second threshold value (ΔVjde2) or less is greater than the first threshold value.
[Configuration 7]
The bypass switch (51) is a switch that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit,
The motor-side electrical path (25) is a path that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch,
The power conversion device according to Configuration 1, comprising a motor-side switch (61) provided in the motor-side electrical path.
[Configuration 8]
The first power storage unit and the second power storage unit are connected in series, or the negative terminal of the first power storage unit is connected to the low potential side through the motor side electrical path, the armature winding, and the inverter. A control unit (100) that determines whether the motor is connected to an electrical path or connected via a motor,
The control unit includes:
When it is determined that the first power storage unit and the second power storage unit are connected to each other in the series connection state, the inter-power storage unit switch is turned on and the bypass switch is turned off;
On the condition that the connection state of the first power storage unit and the second power storage unit is determined to be the connection state via the motor, the inter-power storage unit switch is turned off, and the bypass switch and the motor side switch are turned on. , the power conversion device according to configuration 7.
[Configuration 9]
a first bypass switch (50) that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit;
a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit;
Equipped with
The motor-side electrical path (25) is a path that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch,
The power conversion device according to Configuration 1, comprising a motor-side switch (61) provided in the motor-side electrical path.
[Configuration 10]
The connection state of the first power storage unit and the second power storage unit may be a series connection state, a parallel connection state, or the negative terminal of the first power storage unit may be connected to the motor side electrical path, the armature winding, and the inverter. comprising a control unit (100) that determines whether the motor is connected to the low-potential side electrical path or the motor-via connection state;
The control unit includes:
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the inter-power storage unit switch is turned on, and the first bypass switch and the second bypass switch are turned off,
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, performing a first operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the motor, performing a second operation;
The first operation is an operation of turning off the inter-power storage unit switch and the motor side switch, and turning on the first bypass switch and the second bypass switch,
The second operation is an operation of turning off the power storage unit switch and the first bypass switch, turning on the second bypass switch and the motor side switch, and operating a switch of the inverter. can be,
The switch operation of the inverter is an operation of turning off the upper arm switch of each phase and turning on the lower arm switch of at least one phase, or at least one operation on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. The power conversion device according to configuration 9, wherein the operation is to repeatedly turn on and off the lower arm switch of a phase.
[Configuration 11]
The control unit includes:
It is determined that the connection state of the first power storage unit and the second power storage unit is set to the connection state via the motor, and the potential difference between the first power storage unit and the second power storage unit is equal to or lower than a first threshold value (ΔVjde1). If it is determined that
The connection state of the first power storage unit and the second power storage unit is determined to be the connection state via the motor, and the value obtained by subtracting the voltage of the second power storage unit from the voltage of the first power storage unit is The power conversion device according to configuration 10, wherein the second operation is performed when it is determined that the second threshold value (ΔVjde2) or less is greater than the first threshold value.
[Configuration 12]
As the bypass switch,
a first bypass switch (50) that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit;
a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit;
Equipped with
As the motor side electrical path,
a first motor-side electrical path (26, 27) that electrically connects the armature winding to a side of the second power storage unit of the inter-power storage unit electrical path rather than the inter-power storage unit switch;
a second motor-side electrical path (26, 28) that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path rather than the inter-power storage unit switch;
Equipped with
a first motor side switch (60) provided in the first motor side electrical path;
a second motor side switch (61) provided in the second motor side electrical path;
The power conversion device according to Configuration 1, comprising:
[Configuration 13]
The connection state of the first power storage unit and the second power storage unit may be a series connection state, a parallel connection state, or the positive terminal of the second power storage unit may be connected to the motor side electrical path, the armature winding, and the inverter. The motor is connected to the high-potential electrical path, or the negative terminal of the first power storage unit is connected to the low-potential electrical path via the motor-side electrical path, the armature winding, and the inverter. comprising a control unit (100) for determining which of the via connection states is to be set;
The control unit includes:
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the inter-power storage unit switch is turned on, and the first bypass switch and the second bypass switch are turned off,
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, performing a first operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the motor, performing a second operation or a third operation;
The first operation is an operation of turning off at least one of the first motor-side switch and the second motor-side switch and the inter-power storage unit switch, and turning on the first bypass switch and the second bypass switch. can be,
The second operation is to turn off the power storage section switch, the second bypass switch, and the second motor side switch, turn on the first bypass switch and the first motor side switch, and turn off the inverter switch. This is the operation of operating the first switch of
The third operation is to turn off the power storage section switch, the first bypass switch, and the first motor side switch, turn on the second bypass switch and the second motor side switch, and turn off the inverter switch. This is the operation of operating the second switch of
The first switch operation of the inverter is an operation of turning off the lower arm switch of each phase and turning on the upper arm switch of at least one phase, or on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. It is an operation of repeatedly turning on and off the upper arm switch of at least one phase,
The second switch operation of the inverter is an operation of turning off the upper arm switch of each phase and turning on the lower arm switch of at least one phase, or on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. The power conversion device according to configuration 12, wherein the operation is to repeatedly turn on and off the lower arm switch of at least one phase.
[Configuration 14]
The control unit includes:
It is determined that the connection state of the first power storage unit and the second power storage unit is set to the connection state via the motor, and the potential difference between the first power storage unit and the second power storage unit is equal to or lower than a first threshold value (ΔVjde1). If it is determined that
When it is determined that the connection state of the first power storage unit and the second power storage unit is set to the connection state via the motor, and it is determined that the voltage of the first power storage unit is higher than the voltage of the second power storage unit. , perform the second operation,
When it is determined that the connection state of the first power storage unit and the second power storage unit is set to the connection state via the motor, and it is determined that the voltage of the second power storage unit is higher than the voltage of the first power storage unit. , the power conversion device according to configuration 13, wherein the third operation is performed.
[Configuration 15]
A positive terminal of the charger (200, 210) can be electrically connected to the high potential side electrical path,
A negative terminal of the charger can be electrically connected to the low potential side electrical path,
The control unit includes:
When the charger connected to the high potential side electrical path and the low potential side electrical path is a high voltage charger (200), the connection state of the first power storage unit and the second power storage unit is set to a series connection state. Then, it is determined that
the first power storage unit, on the condition that the charger connected to the high potential side electrical path and the low potential side electrical path is a low voltage charger (210) having a lower charging voltage than the high voltage charger; and the power conversion device according to any one of

Configurations

3, 5, 6, 8, 10, and 11, wherein the power conversion device determines that the connection state of the second power storage unit is set to the motor-via connection state.
[Configuration 16]
A positive terminal of the charger (200, 210) can be electrically connected to the high potential side electrical path,
A negative terminal of the charger can be electrically connected to the low potential side electrical path,
The control unit includes:
When the charger connected to the high potential side electrical path and the low potential side electrical path is a high voltage charger (200), the connection state of the first power storage unit and the second power storage unit is set to a series connection state. Then, it is determined that
the first power storage unit, on the condition that the charger connected to the high potential side electrical path and the low potential side electrical path is a low voltage charger (210) having a lower charging voltage than the high voltage charger; and the power conversion device according to configuration 13 or 14, wherein the power conversion device determines that the connection state of the second power storage unit is set to the first motor-via connection state or the second motor-via connection state.
[Configuration 17]
Configurations 1 to 16, comprising a capacitor (90, 93A, 93B) that electrically connects the target path, which is at least one of the high potential side electrical path and the low potential side electrical path, and the motor side electrical path. The power conversion device according to any one of the above.
[Configuration 18]
When turned on, the target path and the motor-side electric path are electrically connected by the capacitor, and when turned off, at least one of the target path and the motor-side electric path is connected to the capacitor. The power conversion device according to configuration 17, comprising connection switches (91 to 94) that cut off electrical connection.
[Configuration 19]
19. The power conversion device according to configuration 18, wherein the connection switch is turned on when it is determined that a current is to be passed through the motor-side electrical path.
[Configuration 20]
a smoothing capacitor (21) that electrically connects the high potential side electrical path and the low potential side electrical path and smoothes the input voltage of the inverter;
a series connection body of a switch (SP) and a resistor (95);
Equipped with
The capacitor electrically connects the armature winding side of the motor-side electrical path beyond the motor-side switch (60) to the target path;
20. The power conversion device according to any one of configurations 1 to 19, wherein the series connection body is connected in parallel to the motor side switch.
[Configuration 21]
a smoothing capacitor (21) that electrically connects the high potential side electrical path and the low potential side electrical path and smoothes the input voltage of the inverter;
a series connection body of a switch (SP) and a resistor (95);
Equipped with
20. The power conversion device according to any one of configurations 1 to 19, wherein the series connection body is connected in parallel to a motor side switch (60) provided in the motor side electrical path.

Although the present disclosure has been described based on examples, it is understood that the present disclosure is not limited to the examples or structures. The present disclosure also includes various modifications and equivalent modifications. In addition, various combinations and configurations, as well as other combinations and configurations that include only one, more, or fewer elements, are within the scope and scope of the present disclosure.

Claims

a high potential side electrical path (22H) electrically connectable to the positive terminal of the first power storage unit (31);
a low potential side electrical path (22L) electrically connectable to the negative terminal of the second power storage unit (32);
an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path, and a lower arm switch (SWL) electrically connected to the low potential side electrical path;
a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23);
In a power conversion device comprising:
an inter-power storage unit switch (40) provided in an inter-power storage unit electrical path (24) that electrically connects the negative terminal of the first power storage unit and the positive terminal of the second power storage unit;
At least one of the electrical connection between the negative terminals of the first power storage unit and the second power storage unit, and the electrical connection between the positive terminals of the first power storage unit and the second power storage unit Bypass switches (50, 51) for making a connection,
a motor-side electrical path (25 to 28) that electrically connects the armature winding or the conductive member and the inter-power storage unit electrical path;
A power conversion device comprising:
The bypass switch (50) is a switch that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit,
The motor-side electrical path (25) is a path that electrically connects the armature winding to the second power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch,
The power conversion device according to claim 1, further comprising a motor-side switch (60) provided in the motor-side electrical path.
The first power storage unit and the second power storage unit may be connected in series, or the positive terminal of the second power storage unit may be connected to the high potential through the motor-side electrical path, the armature winding, and the inverter. A control unit (100) that determines whether the motor is connected to the side electrical path or the motor-via connection state is selected.
The control unit includes:
When it is determined that the first power storage unit and the second power storage unit are connected to each other in the series connection state, the inter-power storage unit switch is turned on and the bypass switch is turned off;
On the condition that the connection state of the first power storage unit and the second power storage unit is determined to be the connection state via the motor, the inter-power storage unit switch is turned off, and the bypass switch and the motor side switch are turned on. , The power conversion device according to claim 2.
The bypass switch is a first bypass switch (50),
The power conversion device according to claim 2, further comprising a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit.
The connection state of the first power storage unit and the second power storage unit may be a series connection state, a parallel connection state, or a positive terminal of the second power storage unit may be connected to the motor side electrical path, the armature winding, and the inverter. a control unit (100) that determines whether the motor is connected to the high potential side electric path or the motor-via connection state;
The control unit includes:
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the inter-power storage unit switch is turned on, and the first bypass switch and the second bypass switch are turned off,
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, performing a first operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the motor, performing a second operation;
The first operation is an operation of turning off the inter-power storage unit switch and the motor side switch, and turning on the first bypass switch and the second bypass switch,
The second operation is an operation of turning off the power storage unit switch and the second bypass switch, turning on the first bypass switch and the motor side switch, and operating the switch of the inverter,
The switch operation of the inverter is an operation of turning off the lower arm switch of each phase and turning on the upper arm switch of at least one phase, or at least one operation on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. The power conversion device according to claim 4, wherein the operation is to repeatedly turn on and off the upper arm switch of a phase.
The control unit includes:
determining that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state when the potential difference between the first power storage unit and the second power storage unit is equal to or less than a first threshold value (ΔVjde1);
The potential difference between the first power storage unit and the second power storage unit is greater than the first threshold value, and the value obtained by subtracting the voltage of the first power storage unit from the voltage of the second power storage unit is the first power storage unit. The power conversion device according to claim 5, wherein the power conversion device determines that the connection state of the first power storage unit and the second power storage unit is set to the connection state via the motor when the value is equal to or less than a second threshold value (ΔVjde2) larger than the threshold value.
The bypass switch (51) is a switch that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit,
The motor-side electrical path (25) is a path that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch,
The power conversion device according to claim 1, further comprising a motor-side switch (61) provided in the motor-side electrical path.
The first power storage unit and the second power storage unit are connected in series, or the negative terminal of the first power storage unit is connected to the low potential side through the motor side electrical path, the armature winding, and the inverter. A control unit (100) that determines whether the motor is connected to an electrical path or connected via a motor,
The control unit includes:
When it is determined that the first power storage unit and the second power storage unit are connected to each other in the series connection state, the inter-power storage unit switch is turned on and the bypass switch is turned off;
On the condition that the connection state of the first power storage unit and the second power storage unit is determined to be the connection state via the motor, the inter-power storage unit switch is turned off, and the bypass switch and the motor side switch are turned on. , The power conversion device according to claim 7.
As the bypass switch,
a first bypass switch (50) that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit;
a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit;
Equipped with
The motor-side electrical path (25) is a path that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch,
The power conversion device according to claim 1, further comprising a motor-side switch (61) provided in the motor-side electrical path.
The connection state of the first power storage unit and the second power storage unit may be a series connection state, a parallel connection state, or the negative terminal of the first power storage unit may be connected to the motor side electrical path, the armature winding, and the inverter. comprising a control unit (100) that determines whether the motor is connected to the low-potential side electrical path or the motor-via connection state;
The control unit includes:
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the inter-power storage unit switch is turned on, and the first bypass switch and the second bypass switch are turned off,
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, performing a first operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the motor, performing a second operation;
The first operation is an operation of turning off the inter-power storage unit switch and the motor side switch, and turning on the first bypass switch and the second bypass switch,
The second operation is an operation of turning off the power storage unit switch and the first bypass switch, turning on the second bypass switch and the motor side switch, and operating a switch of the inverter. can be,
The switch operation of the inverter is an operation of turning off the upper arm switch of each phase and turning on the lower arm switch of at least one phase, or at least one operation on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. The power conversion device according to claim 9, wherein the operation is to repeatedly turn on and off the lower arm switch of a phase.
The control unit includes:
determining that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state when the potential difference between the first power storage unit and the second power storage unit is equal to or less than a first threshold value (ΔVjde1);
The potential difference between the first power storage unit and the second power storage unit is greater than the first threshold value, and the value obtained by subtracting the voltage of the second power storage unit from the voltage of the first power storage unit is the first power storage unit. 10. The second operation is performed to determine that the connection state of the first power storage unit and the second power storage unit is set to the connection state via the motor when the second power storage unit and the second power storage unit are equal to or less than a second threshold value (ΔVjde2) larger than the threshold value. The power conversion device described in .
As the bypass switch,
a first bypass switch (50) that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit;
a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit;
Equipped with
As the motor side electrical path,
a first motor-side electrical path (26, 27) that electrically connects the armature winding to a side of the second power storage unit of the inter-power storage unit electrical path rather than the inter-power storage unit switch;
a second motor-side electrical path (26, 28) that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path rather than the inter-power storage unit switch;
Equipped with
a first motor side switch (60) provided in the first motor side electrical path;
a second motor side switch (61) provided in the second motor side electrical path;
The power conversion device according to claim 1, comprising:
The connection state of the first power storage unit and the second power storage unit is a series connection state or a parallel connection state, and the positive terminal of the second power storage unit is connected to the motor side electrical path, the armature winding, and the inverter. A state in which the negative terminal of the first power storage unit is connected to the high potential side electrical path, a state in which it is connected via the first motor, or a negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding, and the inverter. a control unit (100) that determines which of the connected state and the connected state via the second motor is to be set;
The control unit includes:
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the inter-power storage unit switch is turned on, and the first bypass switch and the second bypass switch are turned off,
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, performing a first operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the first motor, performing a second operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the second motor, performing a third operation;
The first operation is an operation of turning off at least one of the first motor-side switch and the second motor-side switch and the inter-power storage unit switch, and turning on the first bypass switch and the second bypass switch. can be,
The second operation is to turn off the power storage section switch, the second bypass switch, and the second motor side switch, turn on the first bypass switch and the first motor side switch, and turn off the inverter switch. This is the operation of operating the first switch of
The third operation is to turn off the power storage section switch, the first bypass switch, and the first motor side switch, turn on the second bypass switch and the second motor side switch, and turn off the inverter switch. This is the operation of operating the second switch of
The first switch operation of the inverter is an operation of turning off the lower arm switch of each phase and turning on the upper arm switch of at least one phase, or on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. It is an operation of repeatedly turning on and off the upper arm switch of at least one phase,
The second switch operation of the inverter is an operation of turning off the upper arm switch of each phase and turning on the lower arm switch of at least one phase, or on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. The power conversion device according to claim 12, wherein the operation is repeated turning on and off of at least one phase of the lower arm switch.
The control unit includes:
determining that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state when the potential difference between the first power storage unit and the second power storage unit is equal to or less than a first threshold value (ΔVjde1);
When the potential difference between the first power storage unit and the second power storage unit is larger than the first threshold value, and the voltage of the first power storage unit is higher than the voltage of the second power storage unit, the first power storage unit determining that the connection state of the unit and the second power storage unit is set to the connection state via the first motor,
When the potential difference between the first power storage unit and the second power storage unit is larger than the first threshold value, and the voltage of the second power storage unit is higher than the voltage of the first power storage unit, the first power storage unit The power conversion device according to claim 13, wherein the power conversion device determines that the connection state of the unit and the second power storage unit is set to the connection state via the second motor.
A positive terminal of the charger (200, 210) can be electrically connected to the high potential side electrical path,
A negative terminal of the charger can be electrically connected to the low potential side electrical path,
The control unit includes:
When the charger connected to the high potential side electrical path and the low potential side electrical path is a high voltage charger (200), the connection state of the first power storage unit and the second power storage unit is set to a series connection state. Then, it is determined that
the first power storage unit, on the condition that the charger connected to the high potential side electrical path and the low potential side electrical path is a low voltage charger (210) having a lower charging voltage than the high voltage charger; The power conversion device according to any one of claims 3, 5, 6, 8, 10, and 11, wherein the power converter determines that the second power storage unit is connected to the motor.
A positive terminal of the charger (200, 210) can be electrically connected to the high potential side electrical path,
A negative terminal of the charger can be electrically connected to the low potential side electrical path,
The control unit includes:
When the charger connected to the high potential side electrical path and the low potential side electrical path is a high voltage charger (200), the connection state of the first power storage unit and the second power storage unit is set to a series connection state. Then, it is determined that
the first power storage unit, on the condition that the charger connected to the high potential side electrical path and the low potential side electrical path is a low voltage charger (210) having a lower charging voltage than the high voltage charger; The power conversion device according to claim 13 or 14, wherein the power conversion device determines that the connection state of the second power storage unit is set to the first motor-via connection state or the second motor-via connection state.
Claims 1 to 3, further comprising a capacitor (90, 93A, 93B) that electrically connects the target path, which is at least one of the high potential side electrical path and the low potential side electrical path, and the motor side electrical path. 15. The power conversion device according to any one of 14.
When turned on, the target path and the motor side electric path are electrically connected by the capacitor, and when turned off, at least one of the target path and the motor side electric path is connected to the capacitor. The power conversion device according to claim 17, further comprising a connection switch (91 to 94) for cutting off electrical connection.
The power conversion device according to claim 18, wherein the connection switch is turned on when it is determined that a current should flow through the motor-side electrical path.
a smoothing capacitor (21) that electrically connects the high potential side electrical path and the low potential side electrical path and smoothes the input voltage of the inverter;
a series connection body of a switch (SP) and a resistor (95);
Equipped with
The capacitor electrically connects the armature winding side of the motor-side electrical path beyond the motor-side switch (60) to the target path;
The power conversion device according to claim 17, wherein the series connection body is connected in parallel to the motor side switch.
a smoothing capacitor (21) that electrically connects the high potential side electrical path and the low potential side electrical path and smoothes the input voltage of the inverter;
a series connection body of a switch (SP) and a resistor (95);
Equipped with
The power conversion device according to any one of claims 1 to 14, wherein the series connection body is connected in parallel to a motor-side switch (60) provided in the motor-side electrical path.
a high potential side electrical path (22H) electrically connectable to the positive terminal of the first power storage unit (31);
a low potential side electrical path (22L) electrically connectable to the negative terminal of the second power storage unit (32);
an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path, and a lower arm switch (SWL) electrically connected to the low potential side electrical path;
a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23);
A computer (101) and
In a program applied to a power conversion device equipped with
The power conversion device includes:
an inter-power storage unit switch (40) provided in an inter-power storage unit electrical path (24) that electrically connects the negative terminal of the first power storage unit and the positive terminal of the second power storage unit;
a bypass switch (50) that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit;
a motor-side electrical path (25) that electrically connects the armature winding and the second power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch;
a motor-side switch (60) provided in the motor-side electrical path;
Equipped with
to the computer;
The first power storage unit and the second power storage unit may be connected in series, or the positive terminal of the second power storage unit may be connected to the high potential through the motor-side electrical path, the armature winding, and the inverter. A process of determining whether to be in a state connected to a side electrical path or a state connected via a motor;
When it is determined that the first power storage unit and the second power storage unit are connected to each other in the series connection state, turning on the inter-power storage unit switch and turning off the bypass switch;
On the condition that the connection state of the first power storage unit and the second power storage unit is determined to be the connection state via the motor, the inter-power storage unit switch is turned off, and the bypass switch and the motor side switch are turned on. processing and
A program that makes you do something.
a high potential side electrical path (22H) electrically connectable to the positive terminal of the first power storage unit (31);
a low potential side electrical path (22L) electrically connectable to the negative terminal of the second power storage unit (32);
an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path, and a lower arm switch (SWL) electrically connected to the low potential side electrical path;
a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23);
A computer (101) and
In a program applied to a power conversion device equipped with
The power conversion device includes:
an inter-power storage unit switch (40) provided in an inter-power storage unit electrical path (24) that electrically connects the negative terminal of the first power storage unit and the positive terminal of the second power storage unit;
a first bypass switch (50) that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit;
a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit;
a motor-side electrical path (25) that electrically connects the armature winding and the second power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch;
a motor-side switch (60) provided in the motor-side electrical path;
Equipped with
to the computer;
The connection state of the first power storage unit and the second power storage unit may be a series connection state, a parallel connection state, or a positive terminal of the second power storage unit may be connected to the motor side electrical path, the armature winding, and the inverter. a process of determining which state is to be set, that is, a state in which the motor is connected to the high potential side electrical path;
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the process of turning on the inter-power storage unit switch and turning off the first bypass switch and the second bypass switch; and,
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, a process of performing a first operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the motor, a process of performing a second operation;
let them do it;
The first operation is an operation of turning off the inter-power storage unit switch and the motor side switch, and turning on the first bypass switch and the second bypass switch,
The second operation is an operation of turning off the power storage unit switch and the second bypass switch, turning on the first bypass switch and the motor side switch, and operating the switch of the inverter,
The switch operation of the inverter is an operation of turning off the lower arm switch of each phase and turning on the upper arm switch of at least one phase, or at least one operation on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. A program that is an operation that repeatedly turns on and off the upper arm switch of the phase.
a high potential side electrical path (22H) electrically connectable to the positive terminal of the first power storage unit (31);
a low potential side electrical path (22L) electrically connectable to the negative terminal of the second power storage unit (32);
an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path, and a lower arm switch (SWL) electrically connected to the low potential side electrical path;
a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23);
A computer (101) and
In a program applied to a power conversion device equipped with
The power conversion device includes:
an inter-power storage unit switch (40) provided in an inter-power storage unit electrical path (24) that electrically connects the negative terminal of the first power storage unit and the positive terminal of the second power storage unit;
a bypass switch (51) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit;
a motor-side electrical path (25) that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch;
a motor-side switch (61) provided in the motor-side electrical path;
Equipped with
to the computer;
The first power storage unit and the second power storage unit are connected in series, or the negative terminal of the first power storage unit is connected to the low potential side through the motor side electrical path, the armature winding, and the inverter. A process of determining whether to be in a state connected to an electrical path or a state connected via a motor;
When it is determined that the first power storage unit and the second power storage unit are connected to each other in the series connection state, turning on the inter-power storage unit switch and turning off the bypass switch;
On the condition that the connection state of the first power storage unit and the second power storage unit is determined to be the connection state via the motor, the inter-power storage unit switch is turned off, and the bypass switch and the motor side switch are turned on. processing and
A program that makes you do something.
a high potential side electrical path (22H) electrically connectable to the positive terminal of the first power storage unit (31);
a low potential side electrical path (22L) electrically connectable to the negative terminal of the second power storage unit (32);
an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path, and a lower arm switch (SWL) electrically connected to the low potential side electrical path;
a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23);
A computer (101) and
In a program applied to a power conversion device equipped with
The power conversion device includes:
an inter-power storage unit switch (40) provided in an inter-power storage unit electrical path (24) that electrically connects the negative terminal of the first power storage unit and the positive terminal of the second power storage unit;
a first bypass switch (50) that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit;
a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit;
a motor-side electrical path (25) that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path from the inter-power storage unit switch;
a motor-side switch (61) provided in the motor-side electrical path;
Equipped with
to the computer;
The connection state of the first power storage unit and the second power storage unit may be a series connection state, a parallel connection state, or the negative terminal of the first power storage unit may be connected to the motor side electrical path, the armature winding, and the inverter. A process of determining which state is to be selected, which is a state connected to the low potential side electrical path and a state connected via the motor;
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the process of turning on the inter-power storage unit switch and turning off the first bypass switch and the second bypass switch; and,
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, a process of performing a first operation;
If it is determined that the connection state of the first power storage unit and the second power storage unit is to be the connection state via the motor, a process of performing a second operation;
let them do it;
The first operation is an operation of turning off the inter-power storage unit switch and the motor side switch, and turning on the first bypass switch and the second bypass switch,
The second operation is an operation of turning off the power storage unit switch and the first bypass switch, turning on the second bypass switch and the motor side switch, and operating a switch of the inverter. can be,
The switch operation of the inverter is an operation of turning off the upper arm switch of each phase and turning on the lower arm switch of at least one phase, or at least one operation on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. A program that is an operation that repeatedly turns on and off the lower arm switch of the phase.
a high potential side electrical path (22H) electrically connectable to the positive terminal of the first power storage unit (31);
a low potential side electrical path (22L) electrically connectable to the negative terminal of the second power storage unit (32);
an inverter (20) having an upper arm switch (SWH) electrically connected to the high potential side electrical path, and a lower arm switch (SWL) electrically connected to the low potential side electrical path;
a motor (10) having an armature winding (11) electrically connected to a connection point of the upper arm switch and the lower arm switch via a conductive member (23);
A computer (101) and
In a program applied to a power conversion device equipped with
The power conversion device includes:
an inter-power storage unit switch (40) provided in an inter-power storage unit electrical path (24) that electrically connects the negative terminal of the first power storage unit and the positive terminal of the second power storage unit;
a first bypass switch (50) that electrically connects the negative terminal of the first power storage unit and the negative terminal of the second power storage unit;
a second bypass switch (80) that electrically connects the positive terminal of the first power storage unit and the positive terminal of the second power storage unit;
a first motor-side electrical path (26, 27) that electrically connects the armature winding to a side of the second power storage unit of the inter-power storage unit electrical path rather than the inter-power storage unit switch;
a second motor-side electrical path (26, 28) that electrically connects the armature winding to the first power storage unit side of the inter-power storage unit electrical path rather than the inter-power storage unit switch;
a first motor side switch (60) provided in the first motor side electrical path;
a second motor side switch (61) provided in the second motor side electrical path;
Equipped with
to the computer;
The connection state of the first power storage unit and the second power storage unit is a series connection state or a parallel connection state, and the positive terminal of the second power storage unit is connected to the motor side electrical path, the armature winding, and the inverter. A state in which the negative terminal of the first power storage unit is connected to the high potential side electrical path, a state in which it is connected via the first motor, or a negative terminal of the first power storage unit is connected to the low potential side electrical path via the motor side electrical path, the armature winding, and the inverter. A process of determining which of the connected state and the connected state via the second motor should be selected;
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the series connection state, the process of turning on the inter-power storage unit switch and turning off the first bypass switch and the second bypass switch; and,
When it is determined that the connection state of the first power storage unit and the second power storage unit is to be the parallel connection state, a process of performing a first operation;
If it is determined that the first power storage unit and the second power storage unit are connected to each other via the first motor, a process of performing a second operation;
If it is determined that the first power storage unit and the second power storage unit are connected to each other via the second motor, performing a third operation;
let them do it;
The first operation is an operation of turning off at least one of the first motor-side switch and the second motor-side switch and the inter-power storage unit switch, and turning on the first bypass switch and the second bypass switch. can be,
The second operation is to turn off the power storage section switch, the second bypass switch, and the second motor side switch, turn on the first bypass switch and the first motor side switch, and turn off the inverter switch. This is the operation of operating the first switch of
The third operation is to turn off the power storage section switch, the first bypass switch, and the first motor side switch, turn on the second bypass switch and the second motor side switch, and turn off the inverter switch. This is the operation of operating the second switch of
The first switch operation of the inverter is an operation of turning off the lower arm switch of each phase and turning on the upper arm switch of at least one phase, or on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. It is an operation of repeatedly turning on and off the upper arm switch of at least one phase,
The second switch operation of the inverter is an operation of turning off the upper arm switch of each phase and turning on the lower arm switch of at least one phase, or on the condition that the upper and lower arm switches of the same phase are not turned on at the same time. A program that is an operation of repeatedly turning on and off the lower arm switch of at least one phase.